1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | package org.apache.hadoop.mapred; |
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19 | |
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20 | import org.apache.hadoop.conf.Configuration; |
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21 | import org.apache.hadoop.fs.*; |
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22 | import org.apache.hadoop.hdfs.MiniDFSCluster; |
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23 | import org.apache.hadoop.mapred.TestJobTrackerRestart; |
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24 | |
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25 | import junit.framework.TestCase; |
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26 | import java.io.*; |
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27 | |
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28 | /** |
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29 | * This test checks if the jobtracker can detect and recover a tracker that was |
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30 | * lost while the jobtracker was down. |
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31 | */ |
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32 | public class TestJobTrackerRestartWithLostTracker extends TestCase { |
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33 | final Path testDir = new Path("/jt-restart-lost-tt-testing"); |
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34 | final Path inDir = new Path(testDir, "input"); |
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35 | final Path shareDir = new Path(testDir, "share"); |
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36 | final Path outputDir = new Path(testDir, "output"); |
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37 | |
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38 | private JobConf configureJob(JobConf conf, int maps, int reduces, |
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39 | String mapSignal, String redSignal) |
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40 | throws IOException { |
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41 | UtilsForTests.configureWaitingJobConf(conf, inDir, outputDir, |
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42 | maps, reduces, "test-jobtracker-restart-with-lost-tt", |
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43 | mapSignal, redSignal); |
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44 | return conf; |
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45 | } |
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46 | |
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47 | public void testRecoveryWithLostTracker(MiniDFSCluster dfs, |
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48 | MiniMRCluster mr) |
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49 | throws IOException { |
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50 | FileSystem fileSys = dfs.getFileSystem(); |
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51 | JobConf jobConf = mr.createJobConf(); |
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52 | int numMaps = 50; |
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53 | int numReds = 1; |
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54 | String mapSignalFile = UtilsForTests.getMapSignalFile(shareDir); |
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55 | String redSignalFile = UtilsForTests.getReduceSignalFile(shareDir); |
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56 | |
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57 | // Configure the jobs |
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58 | JobConf job = configureJob(jobConf, numMaps, numReds, |
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59 | mapSignalFile, redSignalFile); |
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60 | |
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61 | fileSys.delete(shareDir, true); |
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62 | |
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63 | // Submit a master job |
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64 | JobClient jobClient = new JobClient(job); |
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65 | RunningJob rJob = jobClient.submitJob(job); |
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66 | JobID id = rJob.getID(); |
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67 | |
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68 | // wait for the job to be inited |
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69 | mr.initializeJob(id); |
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70 | |
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71 | // Make sure that the master job is 50% completed |
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72 | while (UtilsForTests.getJobStatus(jobClient, id).mapProgress() |
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73 | < 0.5f) { |
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74 | UtilsForTests.waitFor(100); |
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75 | } |
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76 | |
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77 | // Kill the jobtracker |
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78 | mr.stopJobTracker(); |
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79 | |
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80 | // Signal the maps to complete |
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81 | UtilsForTests.signalTasks(dfs, fileSys, true, mapSignalFile, redSignalFile); |
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82 | |
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83 | // Enable recovery on restart |
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84 | mr.getJobTrackerConf().setBoolean("mapred.jobtracker.restart.recover", |
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85 | true); |
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86 | |
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87 | // Kill the 2nd tasktracker |
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88 | mr.stopTaskTracker(1); |
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89 | |
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90 | // Wait for a minute before submitting a job |
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91 | UtilsForTests.waitFor(60 * 1000); |
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92 | |
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93 | // Restart the jobtracker |
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94 | mr.startJobTracker(); |
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95 | |
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96 | // Check if the jobs are still running |
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97 | |
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98 | // Wait for the JT to be ready |
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99 | UtilsForTests.waitForJobTracker(jobClient); |
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100 | |
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101 | // Signal the reducers to complete |
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102 | UtilsForTests.signalTasks(dfs, fileSys, false, mapSignalFile, |
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103 | redSignalFile); |
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104 | |
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105 | UtilsForTests.waitTillDone(jobClient); |
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106 | |
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107 | // Check if the tasks on the lost tracker got re-executed |
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108 | assertEquals("Tracker killed while the jobtracker was down did not get lost " |
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109 | + "upon restart", |
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110 | jobClient.getClusterStatus().getTaskTrackers(), 1); |
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111 | |
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112 | // validate the history file |
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113 | TestJobHistory.validateJobHistoryFileFormat(id, job, "SUCCESS", true); |
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114 | TestJobHistory.validateJobHistoryFileContent(mr, rJob, job); |
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115 | } |
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116 | |
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117 | public void testRestartWithLostTracker() throws IOException { |
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118 | String namenode = null; |
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119 | MiniDFSCluster dfs = null; |
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120 | MiniMRCluster mr = null; |
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121 | FileSystem fileSys = null; |
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122 | |
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123 | try { |
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124 | Configuration conf = new Configuration(); |
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125 | conf.setBoolean("dfs.replication.considerLoad", false); |
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126 | dfs = new MiniDFSCluster(conf, 1, true, null, null); |
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127 | dfs.waitActive(); |
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128 | fileSys = dfs.getFileSystem(); |
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129 | |
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130 | // clean up |
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131 | fileSys.delete(testDir, true); |
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132 | |
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133 | if (!fileSys.mkdirs(inDir)) { |
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134 | throw new IOException("Mkdirs failed to create " + inDir.toString()); |
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135 | } |
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136 | |
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137 | // Write the input file |
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138 | UtilsForTests.writeFile(dfs.getNameNode(), conf, |
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139 | new Path(inDir + "/file"), (short)1); |
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140 | |
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141 | dfs.startDataNodes(conf, 1, true, null, null, null, null); |
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142 | dfs.waitActive(); |
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143 | |
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144 | namenode = (dfs.getFileSystem()).getUri().getHost() + ":" |
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145 | + (dfs.getFileSystem()).getUri().getPort(); |
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146 | |
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147 | // Make sure that jobhistory leads to a proper job restart |
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148 | // So keep the blocksize and the buffer size small |
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149 | JobConf jtConf = new JobConf(); |
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150 | jtConf.set("mapred.jobtracker.job.history.block.size", "1024"); |
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151 | jtConf.set("mapred.jobtracker.job.history.buffer.size", "1024"); |
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152 | jtConf.setInt("mapred.tasktracker.reduce.tasks.maximum", 1); |
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153 | jtConf.setLong("mapred.tasktracker.expiry.interval", 25 * 1000); |
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154 | jtConf.setInt("mapred.reduce.copy.backoff", 4); |
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155 | |
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156 | mr = new MiniMRCluster(2, namenode, 1, null, null, jtConf); |
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157 | |
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158 | // Test Lost tracker case |
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159 | testRecoveryWithLostTracker(dfs, mr); |
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160 | } finally { |
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161 | if (mr != null) { |
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162 | try { |
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163 | mr.shutdown(); |
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164 | } catch (Exception e) {} |
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165 | } |
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166 | if (dfs != null) { |
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167 | try { |
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168 | dfs.shutdown(); |
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169 | } catch (Exception e) {} |
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170 | } |
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171 | } |
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172 | } |
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173 | |
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174 | public static void main(String[] args) throws IOException { |
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175 | new TestJobTrackerRestartWithLostTracker().testRestartWithLostTracker(); |
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176 | } |
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177 | } |
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